There are almost 600 American athletes performing in these Olympics. IN the two weeks that the Olympics run, it would be next to impossible to run every human or heroic story on each one of them. And you want them to cover the whole of the Olympics? Get a reality check dude!
And besides, they do cover other stories of athletes from other nations. I remember hearing a story about an African athlete and how he got to the Olympics. I heArd a story of an English mother who carried the torch in honor of her son, who died just days before the torch arrived to their town. And I recall that during the parade of nations, they had the human story of almost every flag bearer in the parade! I think that was pretty damned impressive. And last, this is America, and NBC is an American network, and I would expect them to carry human stories about AMERICAN athletes, mostly.